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Drying of Carrot Strips in Indirect Solar Dehydrator with Photovoltaic Cell and Thermal Energy Storage

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  • Pedro Cerezal-Mezquita

    (Departamento de Ciencias de los Alimentos y Nutrición, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Avenida Universidad de Antofagasta #02800, Campus Coloso, Antofagasta P.O. Box 1240000, Chile)

  • Waldo Bugueño-Muñoz

    (Departamento de Ciencias de los Alimentos y Nutrición, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Avenida Universidad de Antofagasta #02800, Campus Coloso, Antofagasta P.O. Box 1240000, Chile
    Programa de Magister en Desarrollo Energético, Facultad de Ingeniería, Universidad de Antofagasta, Avenida Universidad de Antofagasta #02800, Campus Coloso, Antofagasta P.O. Box 1240000, Chile)

Abstract

Minimizing agricultural losses, accompanied by employing technologies capable of taking advantage of solar energy, are the current challenges of the Antofagasta region of Chile due to having an average solar irradiance of 7.2 kWh/m 2 per day. With this objective, using an indirect solar dryer with storage of thermal energy in the form of sensible heat, the effect of drying on the quality of carrot strips was studied using chromatic coordinates CIEL*a*b*, the color difference (ΔE), the relationship between redness/yellowness (R = a*/b*), browning index (BI), whiteness index (WI), chroma (C), hue angle (h°) and drying kinetics. The experimental drying data were fitted to 15 typically employed nonlinear regression models. The ΔE = 14.11 ± 0.14 between the carrots in the dry and fresh conditions represented a detectable color change, the R ratio increased from 0.75 to 0.89, the BI index decreased from 209.82 ± 0.62 to 148.38 ± 0.26 and the WI index increased from 24.5 ± 0.11 to 31.8 ± 0.17, indicating color affectations due to the process. The coefficients of determination, (R 2 ) close to 1 and the values closest to 0 of χ 2 , SSE and RMSE, led to the best fit corresponding to the Weibull distribution model. In addition, it was found that the operation of the drying installation in the hours without incident solar radiation maintained the drying temperature values throughout the process.

Suggested Citation

  • Pedro Cerezal-Mezquita & Waldo Bugueño-Muñoz, 2022. "Drying of Carrot Strips in Indirect Solar Dehydrator with Photovoltaic Cell and Thermal Energy Storage," Sustainability, MDPI, vol. 14(4), pages 1-18, February.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:4:p:2147-:d:748809
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    References listed on IDEAS

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